Mean stress effects in biaxial fatigue of Inconel 718

Journal Article · Sun Jul 01 04:00:00 EDT 1984 · J. Eng. Mater. Technol.; (United States)

DOI:https://doi.org/10.1115/1.3225707· OSTI ID:6346582

Socie, D F; Shield, T W

Biaxial fatigue tests were conducted on Inconel 718 thin-walled tubular specimens to quantify the effect of mean stress. The specimens were loaded in combined tension and torsion in strain control at room temperature. Fatigue lives ranged from 3000 to 15,000 cycles depending on the mean stress. These data were correlated with a parameter based on the maximum plastic shear strain amplitude, normal strain amplitude and mean normal stress on the plane of maximum shear strain amplitude. This parameter was combined with the Coffin-Manson equation for estimating fatigue lives. Observations of the cracking behavior show that mean stress affects the rate of crack growth and distribution of cracks.

• Research Organization: University of Illinois at Urbana-Champaign, Urbana, IL
• OSTI ID: 6346582
• Journal Information: J. Eng. Mater. Technol.; (United States), Journal Name: J. Eng. Mater. Technol.; (United States) Vol. 106:3; ISSN JEMTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CRACK PROPAGATION
DESTRUCTIVE TESTING
FATIGUE
FRACTURE MECHANICS
INCONEL 718
INCONEL ALLOYS
MATERIALS TESTING
MECHANICAL PROPERTIES
MECHANICS
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM ALLOYS
SERVICE LIFE
STRAINS
STRESS ANALYSIS
STRESS INTENSITY FACTORS
STRESSES
TESTING
TUBES